Python3.5 Learning notes-file operations

in the in Python, the action file object is created using the open function, and the following table lists the functions that are commonly used for file manipulation :

Serial Number
Method and Description

1.file.close ()

Close the file. The file can no longer read and write after closing.

2.file.flush ()

refreshes the file internal buffer, directly writes the internal buffer data immediately to the file, rather than passively waits for the output buffer to write.

3.file.fileno ()

returns a file descriptor for an integer type (File descriptor FD integer ), can be used in such OS module's Read methods, and so on some underlying operations.

4.file.isatty ()

if the file is connected to an end device, return True, otherwise False is returned .

5.file.next ()

Returns the next line of the file.

6.file.read ([size])

Reads the specified number of bytes from the file, if none is given or is negative.

7.file.readline ([size])

reads the entire row, including The "\ n" character.

8.file.readlines ([Sizehint])

reads all rows and returns a list, and if given sizeint>0, returns a row with a sum of approximately sizeint bytes , the actual read value may be more than Sizhint larger , because the buffer needs to be populated.

9.file.seek (offset[, whence])

Set the current location of the file

10.file.tell ()

Returns the current location of the file.

11.file.truncate ([size])

intercepts the file, the truncated byte is specified by size, and the default is the current file location.

12.file.write (str)

Writes a string to the file without a return value.

13.file.writelines (Sequence)

Writes a list of sequence strings to the file and adds a newline character to each line if a line break is required.

Example diagram

Python3.5 Learning notes-file operations